Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/audaspace/plugins/jack/JackDevice.h

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+/*******************************************************************************
+ * Copyright 2009-2016 Jörg Müller
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ ******************************************************************************/
+
+#pragma once
+
+#ifdef JACK_PLUGIN
+#define AUD_BUILD_PLUGIN
+#endif
+
+/**
+ * @file JackDevice.h
+ * @ingroup plugin
+ * The JackDevice class.
+ */
+
+#include <atomic>
+#include <condition_variable>
+#include <string>
+#include <thread>
+
+#include <jack/jack.h>
+
+#include "devices/MixingThreadDevice.h"
+#include "util/Buffer.h"
+
+AUD_NAMESPACE_BEGIN
+
+/**
+ * This device plays back through JACK.
+ */
+class AUD_PLUGIN_API JackDevice : public MixingThreadDevice
+{
+private:
+	/**
+	 * The output ports of jack.
+	 */
+	jack_port_t** m_ports;
+
+	/**
+	 * The jack client.
+	 */
+	jack_client_t* m_client;
+
+	/**
+	 * The deinterleaving buffer.
+	 */
+	Buffer m_deinterleavebuf;
+
+	/**
+	 * Invalidates the jack device.
+	 * \param data The jack device that gets invalidet by jack.
+	 */
+	AUD_LOCAL static void jack_shutdown(void* data);
+
+	/**
+	 * Mixes the next bytes into the buffer.
+	 * \param length The length in samples to be filled.
+	 * \param data A pointer to the jack device.
+	 * \return 0 what shows success.
+	 */
+	AUD_LOCAL static int jack_mix(jack_nframes_t length, void* data);
+
+	AUD_LOCAL static int jack_sync(jack_transport_state_t state, jack_position_t* pos, void* data);
+
+	/**
+	 * Last known JACK Transport state used for stop callbacks.
+	 */
+	jack_transport_state_t m_lastState;
+
+	/**
+	 * Last known JACK Transport state used for stop callbacks.
+	 */
+	jack_transport_state_t m_lastMixState;
+
+	/**
+	 * Time for a synchronisation request.
+	 */
+	std::atomic<float> m_syncTime;
+
+	/**
+	 * Sync revision used to notify the mixing thread that a sync call is necessary.
+	 */
+	std::atomic<int> m_syncCallRevision;
+
+	/**
+	 * The sync revision that the last sync call in the mixing thread handled.
+	 */
+	std::atomic<int> m_lastSyncCallRevision;
+
+	/**
+	 * Sync revision that is increased every time jack transport enters the rolling state.
+	 */
+	int m_rollingSyncRevision;
+
+	/**
+	 * The last time the jack_sync callback saw the rolling sync revision.
+	 *
+	 * Used to ensure the sync callback will be called when consecutive syncs target the same sync time.
+	 */
+	int m_lastRollingSyncRevision;
+
+	/**
+	 * External syncronisation callback function.
+	 */
+	syncFunction m_syncFunc;
+
+	/**
+	 * Data for the sync function.
+	 */
+	void* m_syncFuncData;
+
+	AUD_LOCAL void preMixingWork(bool playing) override;
+
+	// delete copy constructor and operator=
+	JackDevice(const JackDevice&) = delete;
+	JackDevice& operator=(const JackDevice&) = delete;
+
+protected:
+	virtual void playing(bool playing);
+
+public:
+	/**
+	 * Creates a JACK client for audio output.
+	 * \param name The client name.
+	 * \param specs The wanted audio specification, where only the channel count
+	 *              is important.
+	 * \param buffersize The size of the internal buffer.
+	 * \exception Exception Thrown if the audio device cannot be opened.
+	 */
+	JackDevice(const std::string &name, DeviceSpecs specs, int buffersize = AUD_DEFAULT_BUFFER_SIZE);
+
+	/**
+	 * Closes the JACK client.
+	 */
+	virtual ~JackDevice();
+
+	/**
+	 * Starts jack transport playback.
+	 */
+	void playSynchronizer();
+
+	/**
+	 * Stops jack transport playback.
+	 */
+	void stopSynchronizer();
+
+	/**
+	 * Seeks jack transport playback.
+	 * \param time The time to seek to.
+	 */
+	void seekSynchronizer(double time);
+
+	/**
+	 * Sets the sync callback for jack transport playback.
+	 * \param sync The callback function.
+	 * \param data The data for the function.
+	 */
+	void setSyncCallback(syncFunction sync, void* data);
+
+	/**
+	 * Retrieves the jack transport playback time.
+	 * \return The current time position.
+	 */
+	double getSynchronizerPosition();
+
+	/**
+	 * Returns whether jack transport plays back.
+	 * \return Whether jack transport plays back.
+	 */
+	int isSynchronizerPlaying();
+
+	/**
+	 * Registers this plugin.
+	 */
+	static void registerPlugin();
+};
+
+AUD_NAMESPACE_END